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shall further provide a list of all chemicals used, manufacturing processes used and <br />composition of the effluent to be discharged, to the Service Director. The owner shall <br />comply with all additional requirements set forth in Chapter 917. <br />(e) A separate and independent building sewer shall be provided for each unit of a <br />condominium building consisting of three units or less, and for every building, except <br />that where one building stands at the rear of an existing building, other than a <br />condominium, on an interior lot and no private sewer is available or can be constructed to <br />the rear building through an adjoining alley, court, yard or driveway, the building sewer <br />from the front building may be extended to the rear building and the whole considered as <br />one building sewer. <br />(f) Old building sewers may not be used in connection with new buildings. <br />No more than one building sewer may be tied into a riser from the sewer main. <br />(g) The connection of the building sewer into the public sewer shall conform to the <br />requirements as established by the County Sanitary Engineering Department, or by the <br />ordinances of the City, whichever is more restrictive. <br />(h) The size, slope, alignment and materials of construction of a building sewer and <br />the methods to be used in excavating, placing of the pipe, jointing, testing and backfilling <br />the trench shall all conform to the requirements as established by the County Sanitary <br />Engineering Department, or by the ordinances of the City, whichever is more restrictive. <br />All trenches shall include a clay or concrete collar to serve as an anti -seep cut-off wall to <br />prevent migration of groundwater from the public sewer trench to building footer drains. <br />(i) Whenever possible, the building sewer shall be brought to the building at an <br />elevation below the basement floor. In all buildings in which any building drain is too <br />low to permit gravity to the public sewer, sanitary sewage carried by such building shall <br />be lifted by an approved means and discharged to the building sewer. The basement <br />floor of a house or building shall be not less than five feet above the top of the sanitary <br />sewer pipe where the building sewer connects to the public sewer unless the sewage is <br />lifted by an approved means. The basement floor of a house or building shall be not less <br />