(a)   The building sewer shall be constructed of vitrified clay sewer pipe, PVC or cast iron soil pipe, as approved by the Building Inspector.  The City reserves the right to specify and require the encasement of any sewer pipe in concrete or the installation of the sewer pipe in a concrete cradle if the foundation and construction are such as to warrant such protection in the opinion of the Building Inspector.
   (b)   The size and slope of the building sewer shall be subject to the approval of the Building Inspector, but in no event shall the diameter of the pipe be less than four inches.  The slope of such pipe shall be not less than one-quarter inch per foot, unless otherwise permitted.
   (c)   Whenever possible, the building sewer shall be brought to the building at an elevation below the basement floor.  No building sewer shall be laid parallel to or within three feet of any bearing wall which might thereby be weakened.  The depth shall be sufficient to afford protection from frost.  The building sewer shall be laid at uniform grade.  The line shall be straight or laid with properly curved pipe and fittings.  Changes in direction greater than forty-five degrees shall be provided with clean-outs accessible for cleaning.
   (d)   In all buildings in which a building drain is too low to permit gravity flow to the public sewer, sanitary sewage carried by such drain shall be lifted by artificial means, approved by the Building Inspector, and discharged to the building sewer.
   (e)   All joints and connections shall be made gastight and watertight.  All joints shall be approved by the Building Inspector.
(Ord. 588.  Passed 11-15-93.)