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Section 10.1.2 Unless otherwise stated, a sanitary sewer main of eight (8 ") inch diameter shall be expected as the minimum size and service connection pipe shall be at least four (4") inches in diameter. The service connection pipe shall be installed at grades approved by the City Engineer. Section 10.2 Joints And Connections Section 10.2.1 Joints for cast iron pipe and vitrified clay sewer pipe or for joints or connections between different types of pipe shall be in the manner and of a kind prescribed by the City Engineer. The City shall provide a list of various types and kinds of joints and connections which are approved by the City Engineer and the types and kinds of joints that are prohibited. Section 10.3 Grades Section 10.3.1 Unless otherwise authorized, all house sewers shall have a grade of not less than one -eighth (1/8") inch per foot. A grade of one -quarter (1/4") inch should be used whenever practical. The contractor shall check grades before construction proceeds and he shall install the house sewer by exposing the wye at the sewer main or the service stub and at the property line. He shall connect to the wye or service stub and shall lay the house sewer line from the wye or service stub to the building. Whenever possible the connecting sewer shall joint the building at an elevation which is below the basement floor of such building. Section 10.4 Alignment Section 10.4.1 No connecting sewer shall contain bends or a combination of bends which at any point shall be greater than forty-five (45°) degrees and no more than two (2) bends, regardless of angle, shall be permitted in any single house connection except where manholes or clean -outs are constructed at such points and in the manner as directed by the City Engineer. No connecting sewer shall be laid parallel to any bearing wall or footing unless it is placed at least three (3') feet from any such bearing wall or footing. No connecting sewer shall be laid within twenty (20') feet of any existing well unless cast iron soil pipe is used. Section 10.5 Trenching And Backfilling Section 10.5.1 All excavations shall be open trench work unless otherwise authorized by the City Engineer. The foundation of the trench shall be formed to prevent any subsequent settlement of the pipes. If the foundation is good and firm earth, the earth shall be pared and molded to give a full support to the lower third (1/3) of the pipe. Bell holes shall be dug to provide sample space for bells. Care must be exercised in back filling below the center line of the pipe in order to give it proper support. Back filling shall be placed in layers and solidly tamped or packed to two (2') feet above the pipe. Back filling shall not be done until the section to be back filled has been inspected by the City Engineer, his representative and the Plumbing Inspector. IRM